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given your previous history of tendon rupture and surgery, first of all it need to be determined that whether you have achilles tendon contracture or not
that can be determined by examination by an orthopedic doctor
if confirmed then treatment for this is raising the inside heel of the shoe in the reflex position and then gradually lowering the heels of shoes and stretching exercises or using support braces
but if the cause is not contracture, then you can consult aphysiotherapist for need of stretching exercises
after 3 years of surgery the improvement on stretching exercises might be slow of less, but it would help you to some extent